I thought I’d share my response to question that I saw posted on the internet “What is it like to have “crossing” of the senses known as synesthesia?”
It is nothing like a “crossing of the senses”, because that is not what it is or how it works, regardless of the countless times that clueless non-synaesthete academics have described it that way. I do not see a colour in response to a sound instead of hearing a sound. My senses of smell, taste, vision and the other senses are normal or good for my age. Another way in which synaesthesia is not a crossing of the senses is the countless types of synaesthesia that do not have simple sensory experiences as either inducers or concurrents. Sometimes thinking of a very specific concept will trigger for a very brief time a visual memory of a scene of a place that I visited decades ago, as it looked then. The inducer is purely abstract, not sensory, and the concurrent is a memory of a visual nature. Clearly the concurrent is not a sensory experience because it is not a scene that I saw at that time, md also because the scene was the way the place looked many years ago, not as it looked at that time. This type of synaesthesia, a type that I experience quite often among many other more widely-known types of synaesthesia, is a memory of a visual sensory experience, and is not an actual sensory experience. If I actually thought that my synaesthesia concurrents were real sensory experiences, I’d be fit for a psychiatric institution, because that would be a type of hallucination.
Clearly synaesthesia as a phenomenon that involves memory, or the neural processes that give rise to memory, because numerous studies have found various types of memory superiority associated with various types of synaesthesia, often these links being between memory and synaesthesia centred upon the same areas of mental processing. This is one of the intriguing things that I have noticed about my own synaesthesia, which inspired me to write the very first post in this blog, about The Strange Phenomenon, which is an unusual and not previously described type of synaesthesia in which the inducer is a specific face viewed from a very specific angle and the concurrent is a memory of another person’s (similar) face and entire persona (face, mannerisms, personality, voice). This repeated experience linking synaesthesia with face memory prompted me to do face memory tests, including the short form of the CFMT, and unexpectedly discover my own status as a super-recognizer, a form of memory superiority in face memory.
Synaesthesia is not hallucination and synaesthetes generally understand that concurrents are not real, current sensory experiences. We understand this because we can see set patterns among groups of inducers and concurrents and know what to expect because of the great reliability of these associations between thoughts that belong in set categories. An example would be grapheme colour synaesthesia, in which most of the letters of the alphabet (a category) are individually reliably asspcoated with specific colours (another category). The way this trype of syanesthesia is experienced is more like learning or knowledge than the rapid and fleeting triggering of memories, but Iguess learning and knowledge are based on memory. With some more rarely-experienced types of synaesthesia with concurrents that seem like current sensory experiences (as in my white chocolate-flavoured hugs synaesthesia), I have been able to pick them as synaesthesia concurrents or sensory memories rather than hallucination or normal sensory experiences because the sensations are extremely brief in duration – they flash in and out of the mind in an instant, or hit like a bolt of lightning, leaving you wondering, and if I hadn’t made the effort to keep a record of these associations by writing them down, they would be quickly forgotten and not obvious as instances of synaesthesia due to their ephemeral nature. These sensations or experiences cannot be mistaken as normal sensory experiences. I think anyone who describes their synaesthesia as hard to pick from reality or like a hallucination, or constantly-occurring, is probably lying, or at least confused.
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